Driving mechanism for cycles.



PaAtanted lan. 22, 190|.

J. PARKER.

DRIVING MECHANISM FDR CYCLES,

Application med' Nov. 18,' 189'9.)

2 Sheets-Sheet l.

FND Model.)

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No. 666,548. Patented Jan. 22, |90I. J. PARKER.

DRIVINGMECHANISM FOR CYCLES. (Application led Nov. 18, 1899.)

(No Model.) 2 Sheets-Sheet 2.

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Nirnn STATES JOHN PARKER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO PASOHAL HOLLINGSWORTH MORRIS, OF SAME PLACE.

DRIVING IVIECHANISVI FOR CYCLES.

SPECIFICATION formmg part of Letters Patent No. 666,548, dated January 22, 1901.

I Application filed November 18, 1899. Serial. No. 737,506. (No model.)

To @ZZ whom, it may concer-11,:

Be it known that I, JOHN PARKER, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Driving Mechanism for Cycles, of which the following is a specification.

My invention consists of certain improvements in the driving mechanism for bicycles, for which I have obtained Letters Patent No. 56l,516, dated Julie 2, 1896, and No. 616,349, dated December 20, 1898, the objects of my present improvements being to provide for the ready assembling or removal of the cranks and crank-shaft without disturbing the bearings or crank-gear, to provide for the convenient adjustment of the driving-gears, and to maintain the rear and lower forks of the frame in fixed and definite relations to each other. These objects I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a view, partly in outside View and partly in sectional plan, of sufficient of a bicycle to illustrate my present invention. Fig. 2 is a view of the rear portion of the same, partly in side elevation and partly in section. Fig. 3 is a view illustrating the parts of the crank-shaft and crank-gear separated from each other. Fig. f1 is a detached View of parts of theigearing. Fig. 5 is a sectional View illustrating a special construction of the crank shaft and gear, and Fig. 6 is a sectional view of another form of crank shaft and gear embodying the invention.

In Fig. 1 the lower forks of the frame are represented at 1 and 2, these forks being rigidly secured at their forward ends to the tubular crank-hanger 3 and carrying at their rear ends the rear axle 1, as in my former patents before alluded to. The crank-hanger 3 has at its opposite ends outer races 5 and 6 for the balls 7, constituting the bearings for the cran k-shaft sleeve 10, the race 6 being adjustable and being held in position after adjustment by a lock-nut 8 or in any other suitable manner. The inner races 9 for the balls 7 are formed upon the sleeve 10, into one end of which is fitted the hub of the gear-wheel 11, which constitutes the primary element of the driving-gear and is locked to one of the cranks 12 by means of projections 13, which enter corresponding recesses 1-1 in the hub of said crank.. The opposite end of the sleeve receives the tubular shaft 15 of the other crank 16, which shaft has at its inner end recesses 17 for the reception of projections 18 upon the inner end of the hub of the gearwheel 11, the projections of said gear-wheel being pressed firmly into the recesses 14 and 17 of the crank hub and shaft by the action of a nut 19, which is adapted to the end of the opening in the hub of the crank 16 and screws upon the threaded end of the shaft 20 of the crank l2, which passes through the hub of the gear-Wheel 11 and also through the hollow shaft of the crank 16. A nut 21 is applied to a threaded portion of the hollow crankshaft 15, adjacent to the crank 16, and bears upon the end of the sleeve 10, so as to lock the shaft 15 thereto andv insure the rotation of the sleeve 10 with said shaft.

In the construction shown in Fig. lthe hub of the gear-wheel 11 is threaded for adaptation to the internally-threaded end of the sleeve 10, while the shaft 15 of the crank 16 fits snuglyiuto the opposite end ofsaid sleeve; but in some cases it may be advisable to reverse this construction, as shown in Fig. 5- that is to say, to provide a simple sliding fit of the hub of the gear-wheel 11 in the end of the sleeve 10 and to screw the shaft 15 into the opposite end of said sleeve, as this construction renders it unnecessary to thread the hub of the gear-Wheel 11, Which must be subsequently hardened. If desired, the crank-shaft may be solid, as shown at 15a in Fig. 6, and may have a projecting threaded portion which passes through the hub of the gear-Wheel 11 and through an opening in the hub of the crank 12, the latter receiving the nut 19. With either construction, however, both cranks are firmly locked in engagement with the gear-wheel 11, and yet the ready introduction and removal of the cranks and their shaft and also of the gear-Wheel are permitted Without disturbing the sleeve 10 or its bearings, and any desired adjustment of the gear-wheel 11 in the direction of the axis of the crank-shaft can be effected `in order to insure the proper mesh of said gear-Wheel IOO sof

Withthe pinion 22 upon the tubular powertransmitting shaft 23, which surrounds 'the lower fork 2 of the frame as before. This pinion 22 is adapted to a bearing in a tubular rearwardly-extending projection of the hanger 3 and is secured to the tubular shaft 23 by somewhat the same means as thoseA adopted for securing the gear-wheel ll to the crank-shaft, recesses 24 iu the hub of the wheel receiving projections 25 on a collar 26, which is secured by brazing or other available means to the tubular shaft 23, a nut 27 applied to the threaded end ofsaidshaft serving to force the pinion 22 rearwardly on the shaft, and thus insure the rigid clutching of the same to the collar 26.

The rear end of the shaft 23 has an eX- panded collar 28, threaded eXternally,fand onto this collar is screwed the internally-V threaded hub of the gear-wheel 29, which drives the pinion 30 on the hub 3l of the rear. wheel ofthe bicycle, a re verse-threadflock-nut 32 screwing into the internally-threaded hub ofthe gear-wheel 29 and bearing against the collar 28, so as to rigidly confine thewheel 29 thereto. The pinion 30 has an externallythreaded hub which is screwed into the in-v ternally-threaded end of the hub 3l of the rear wheel of the bicycle and is locked thereto by means of the ball-race 33, which has at the outer end a flange bearing upon the outer face ofthe pinion 30 and at the inner end a threaded portion engaging with the internally-threaded hub 3l. The hub 3l of the rear wheel is mounted upon bearings on a sleeve 34, surrounding the rear axle 4, so that said rear wheel Aand sleeve can be moved transversely on the axle for gear adjustment, as in the previous patented structures.

yThe rear end of the lowerfork 2 of the lframe is attached to the lower end 35 of one v of the rear braces 36 of the frame, as in former constructions, said part 35 being either integral with or secured to said brace,as `desired; but said portion 35 of the rear brace l'now has its bearing against-a shoulder 37 on the fork 2 instead of upon the inner ball-race '3S=of the bearing for the gear-wheel r29, so that said ball-race 38 can be adjusted upon the threaded portion 39 of the fork 2 to provide for adjustment of gears or bearings with- 1 out affecting the alinement of the frame, projections 40 on the brace 35 engaging with recesses in the ball-race 38 to lock litin position after adjustment.

1Fore-and-aft adjustment of' the rear axle 4, so as to provide for proper meshing ol the teeth `of the gear-wheel 29 and pinion 30, is effected,

Vas before, by means of a nut 41, screwed in-to the internally-threaded projecting end of the axle 4 and bearing upon the lower end 35 of the brace 36.

It `will be observed that the gear-wheels on the side transmitting-shaft are detachable,^so

`as to provide for the hardening of the saine when they are thus detached, it being difficult to harden such a wheel or pinion after it has been attached to the shaft by brazing without impairing its connection with the shaft.

Having thusv described my invention, l claim and desire to secure by Letters Patent- 1. The combination in driving mechanism for cycles, of a crank-hanger, a two-part laterally-separable crank structure, a gear-wheel having locking elements upon its outer and inner sides, means independent of the gearwheel for conning the two parts of the crank structure together and in engagement with the locking elements of the gear-wheel, a sleeve separate'fromthe said wheel and in respect vto-which the wheel is longitudinally adjustable without loosening its locking connection with the crank structure, and bearings for said sleeve in the crank-hanger, substantially las specified.

2. The ycombination in driving mechanism for cycles, of a crank-hanger, a two-part laterally-separable crank structure, a gear-wheel having locking elements upon its inner and outer sides, means independent of the gearwheel for confining the two portions of the crank structure in engagement with said lock- `ing elements, and a bearing-sleeve screwed vatone end -upon a-threadedportion of the shaft. of one of the cranks but free from connection with the crank structure at the other end and having at saidother end a sliding t upon the hub ofk the gear-wheel, whereby longitudinal-adjustment of the-gear-wheel in respect to the sleeve is permittedwithout loosening'l the lockingl connection 'r between said gear-wheel and thecrank-structure, substanv tially` as specified.

3. The combination in driving mechanism for cycles, of the crank-shaft hav-inga driving gear-wheeL thereon, the rear hub vhaving apinion thereon, thevtubular power-transmitting shaft surrounding one of the -lower forks of the' frame and havingvatl the front end a pinion-engaging with the gear-wheel on the crank-shaft andat` the rear Vend a gearwheel engaging with the pinion on therear hub, aud a rear bracehaving depending portion whichLcarries-the rear end oflthe `lower fork projecting-beyond thepower-transfmitting shaft, is-in lockingengagement with the adjustable ball-race for the bearing of the lrear 'gear-wheel, and bearsI against a shoulder t on Vsaid lower fork, substantially as specified.

'In testimony-'whereof I have signed my 'name to this specification in the presence of two subscribing witnesses.

JOHN PARKER.

Witnesses:

WILLA. BARR, Jos. H. KLEIN.

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